The air flow and air pressure of the cooling fan are important parameters in engineering which are used for effective heat dissipation. Let's discuss how to calculate them.
Air flow represents the air volume driven per unit time. The greater the air flow, the more heat can be carried away, thereby improving the heat dissipation efficiency. The calculation formula of air flow is as follows:
Air flow (Q) = (\ frac {1} {\ Delta t}) (unit: CFM)
Air flow (Q) = (\ frac {0} {\ Delta t}) (unit: CMM)
(\ Delta t) refers to the difference between the temperature of the air expelled by the fan and the ambient temperature. For example, if a CPU with thermal power expels air at a temperature of 38 degrees Celsius in a room with a temperature of 28 degrees Celsius, a fan with an air flow of 11.2 CFM fan is required. If the temperature difference is 2 degrees, then a fan with an air flow of 57.2 CFM is needed.
Air pressure indicates the force exerted by the fan on the air. It is related to the wind speed and the fan area. The calculation formula of air pressure is as follows:
Air pressure (P) = (\ frac {\ rho \ cdot V^ 2} {2})
(\ rho) is the air density and (V) represents the wind speed. The relationship between air pressure, air flow and wind speed can be clarified by this formula.
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